AUTO LEVELING CONTROL MODULE CONSTRUCTION/OPERATION

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•  Located inside of the passenger’s side dashboard.
•  Adjusts the optical axis according to the input signal from the PJB, instrument cluster, and the auto leveling sensor.
•  When a malfunction in the auto leveling system is detected, the auto leveling system warning light illuminates to inform the driver of the malfunction.

Optical axis adjustment function

•  Identifies the vehicle speed and attitude variations according to the signal input from the PJB, instrument cluster, and the auto leveling sensor, and calculates the optimum amount for optical axis adjustment.
•  Controls the headlight leveling actuator according to the optical axis adjustment amount.

Initial setting function

•  Records the vehicle height while there are no occupants based on the signal voltage input from the auto leveling sensor when the vehicle is unoccupied.
•  Initial setting must be performed after performing any of the following procedures.
―  Front combination light removal/installation
―  Auto leveling control module replacement
―  Auto leveling sensor removal/installation
―  Suspension replacement or work that effects vehicle height

Fail-safe Function

•  When a malfunction shown in the fail-safe function table is detected, the fail-safe function operates. At this time, the auto leveling system warning light illuminates to inform the driver.
•  Each part is controlled as shown in the fail-safe function table.

Fail-safe function table

Item

Test condition

Fail-safe function

Indicator light

Cancel condition
Auto leveling sensor
Signal malfunction
When signal voltage of auto leveling sensor is 0.49 V or less, or 4.43 V or more, 3 or more times, for approx. 0.04 s is detected.
Returns to initial position if optical axis position is higher than initial position.
Stops optical axis position when malfunction is detected if optical axis position is lower than initial position.
Illuminated*1
When normal status continuous for 1 s or more, or the ignition switch is turned off and then to the ON position again.
Battery voltage
Excessive power supply voltage
When battery voltage of 10 V or less, or 16 V or more is detected
Stops at optical axis position when malfunction is detected.
Not illuminated
When battery voltage between 10-16 V is detected, or the ignition switch is turned off and then to the ON position again.
Auto leveling control module
When malfunction in auto leveling control module is detected.
Resets microcomputer in auto leveling control module.
Illuminated
When the ignition switch is turned off and then to the ON position again.
Headlight leveling actuator
When there is short to power supply or ground in harness between auto leveling control module and headlight leveling actuator
Stops at optical axis position when malfunction is detected.
Illuminated
When normal status continues for 1 s or more.

*1  :Illuminates only when malfunction for 10 s or more is detected.

Note
•  When the ignition switch is turned to the ON position, the auto leveling control module checks the auto leveling warning light bulb and illuminates the bulb for 3 s to indicate that there is no malfunction.
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1
Auto leveling warning light
2
Instrument cluster